Circuit arrangement having a sensor and an evaluation circuit

Details Circuit arrangement having a sensor and an evaluation circuit Circuit arrangement having a sensor and an evaluation circuit

1998-04-23

2001-04-24

Assouad, Patrick (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C324S160000, C702S145000

Reexamination Certificate

active

06223132

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a circuit arrangement having a sensor and an evaluation circuit.
2. Description of the Background Art
It is known when monitoring more than one moving element to assign said elements sensors and to feed the output signals to evaluation circuits which respectively process said output signals. In the case of integrated evaluation circuits, at least one input is required for this purpose per sensor in the case of the evaluation circuit. The sensors can be simply constructed in the case of this previously known solution. However, each sensor requires a dedicated evaluation circuit.
A further previously known solution comprises a bus system. The sensors are connected to an evaluation circuit by means of a bus. The data of the sensors are fed via the bus to the evaluation circuit using a multiplex method. In this solution, the sensors are relatively complex and thus correspondingly expensive.
SUMMARY OF THE INVENTION
The invention is based on the object of specifying a circuit arrangement, having sensors and an evaluation circuit, which uses simply constructed sensors to reduce the outlay on circuitry for an evaluation circuit. dedicated sensor is respectively assigned to said elements-and generates pulses which are characteristic of the element to be monitored. Said pulses are then fed to an evaluation circuit via a common line.
It is advantageous in this case to be able to use simple sensors such as optical elements, Hall elements, mechanical pulse generators or the like.
The signals of the sensors need not be fed to the evaluation circuit via a line using the multiplex method, but can be transmitted, superimposed on one another, on the same line.
It is advantageous to use only one evaluation circuit, which can separate and evaluate the incoming signals. Owing to the uniqueness of the signals, they can be assigned to the connected sensors and, depending on the construction of the evaluation circuit, can be processed sequentially or in parallel.
A microcomputer can advantageously be used for this purpose. The evaluation can then be carried out in a very cost effective fashion by means of a program.
In one embodiment of the invention, the data to be measured are transmitted by periodic repetition of the pulses characterizing the sensors.
The evaluation circuit therefore has no difficulty in monitoring the state of the elements to be monitored, since the latter can be identified uniquely by their pulse shape.
This characterization is preferably achieved by determining each pulse by means of individual pulse width and individual pulse spacing within a pulse period. The result of this is that a unique determination of the origin of the pulses is performed even in the case of superimposition of the pulses of various sensors.


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